Burning fossil fuels produces carbon dioxide that enters the atmosphere, but one car or one coal fire is not a problem, only when it is on a large scale is it a problem. Similarly, chopping down one tree isn't a problem, but chopping down an entire forest is.

Explain why large scale changes to the carbon cycle can cause wide spread air pollution and may lead to global warming and climate change.

The answer is b or dmost likely bhope it

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city. 

Intrusion is the best answer and the newest form.